add resize test checking frame content

Moved shared methods to a head.js file

test/casperjs/integration/include.js

@@ -0,0 +1,30 @@
+/**
+ * Collection of shared methods for casperjs integration tests.
+ */
+
+function evalLine(line) {
+  return casper.evaluate(
+    'function () {return ' + line + '}'
+  );
+}
+
+function getValue(selector) {
+  return casper.evaluate(
+    'function () { \
+      return document.querySelector(\'' + selector + '\').value;\
+    }');
+}
+
+function isChecked(selector) {
+  return casper.evaluate(
+    'function () { \
+      return document.querySelector(\'' + selector + '\').checked;\
+    }');
+}
+
+function isDrawerExpanded() {
+  return casper.evaluate(function () {
+    var settingsElement = document.querySelector('[data-pskl-controller="settings"]');
+    return settingsElement.classList.contains('expanded');
+  });
+}